21434334042 has 32 divisors (see below), whose sum is σ = 46821680640. Its totient is φ = 6487494320.

The previous prime is 21434334037. The next prime is 21434334109. The reversal of 21434334042 is 24043343412.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138168 + ... + 248915.

It is an arithmetic number, because the mean of its divisors is an integer number (1463177520).

Almost surely, 2^21434334042 is an apocalyptic number.

21434334042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21434334042 is an abundant number, since it is smaller than the sum of its proper divisors (25387346598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21434334042 is a wasteful number, since it uses less digits than its factorization.

21434334042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387938.

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 21434334042 its reverse (24043343412), we get a palindrome (45477677454).

The spelling of 21434334042 in words is "twenty-one billion, four hundred thirty-four million, three hundred thirty-four thousand, forty-two".